I have been using natural baits. Dead mouse in dirt hole set. Venison or beaver chunks. Snares leading to a gut pile.
Splash of fox urine or beaver castor as a lure.
WHERE your trap is set is the most important thing.
#1. lure has to be upwind of where the critters will naturally walk.
#2. Trap has to be very close to where they naturally want to walk.
Once I figured out #1, started having a lot more action at my sets. Once I figured out (still figuring) #2 I started getting catches instead of walk bys, and empty fired traps.